On the relations between Portevin Le Chatelier plastic instabilities and precipitation

Y. Brechet, Y. Estrin

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

13 Citations (Scopus)

Abstract

This paper concerns the interplay between dynamic strain ageing and precipitation. The classical behaviour of critical strains (dependence with strain rate and temperature) in the Portevin Le Chatelier effect is briefly reviewed together with its modelling in the Estrin-Kubin-Penning model. The so called 'inverse Portevin Le Chatelier effect', known to occur in concentrated solutions, is often attributed to precipitation. A model for the influence of precipitation on dynamic strain ageing is proposed. Both homogeneous and heterogeneous precipitation is considered. It is shown that as a result of precipitation the critical strains for the occurrence of the Portevin-LeChatelier effect should exhibit an 'inverse' behaviour with temperature and strain rate as compared to the behaviour observed in dilute solid solutions. It is also shown that plasticity induced reversion or disordering can lead, in alloys with a strain rate sensitivity which would be positive, to an apparent negative strain rate sensitivity and to a 'pseudo Portevin Le Chatelier effect'.

Original languageEnglish
Title of host publicationProceedings of the 6th International Symposium on Plasticity of Metals and Alloys
Pages235-250
Number of pages16
Volume97-98
Publication statusPublished - 1994
Externally publishedYes
EventInternational Symposium on Physics of Materials (ISPMA) 1994 - Prague, Czech Republic
Duration: 5 Sep 19949 Sep 1994
Conference number: 6th

Publication series

NameMechanical and corrosion properties. Series A, Key engineering materials
ISSN (Print)0252-1059

Conference

ConferenceInternational Symposium on Physics of Materials (ISPMA) 1994
CountryCzech Republic
CityPrague
Period5/09/949/09/94

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